Louvre structures

A louvre window structure comprising a generally rectangular frame and a plurality of rectangular louvre boards mounted relative to the frame to be pivotable between a closed position in which the longitudinal edges of the louvre boards overlap and are in close contact and an open position in which the louvre boards are separated, wherein each louvre board is mounted with its opposed shorter edges received in channel shaped holding members, said holding members for each louvre board are carried on a bar which extends across the frame and the ends of which are received in recesses in opposed frames members such that each bar is axially rotatable relative to the frame but is prevented from substantial linear movement so that the bars cannot be removed from the frame after the frame and bars structure has been assembled, and wherein the holding members on at least one side of the structure are connected together by a coupling member which is not connected to the frame and a louvre board actuating means is affixed to one only of the holding members whereby said louvre board associated with said holding member can be caused to pivot relative to the frame with the coupling means ensuring simultaneous movement of the remaining louvre boards between a closed and an open position is effected.